<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Document</title>
    </head>
    <body>
        
        <div id="box"></div>

    </body>
</html>
<script src="jquery.min.js"></script>
<script>
    

    $('#box').css('width', '200px').css('height', '200px').css('border', '2px solid black');
    $('#box').html('666');



</script>